Twill vs Devin
A detailed comparison of Twill and Devin, two autonomous AI coding agent platforms. Compare pricing, agent flexibility, integrations, and workflow to find the right fit for your team.
The short version
Twill and Devin are both autonomous AI software engineers that ship pull requests without supervision. Twill is always-on and CLI-agnostic: it runs Claude Code, Codex, or OpenCode using their native harnesses, with proactive scheduling and team memory. Devin is a vertically integrated agent with its own browser, shell, and editor. Twill starts at $50/month; Devin starts at $20/month plus usage-based ACUs.
What is Twill?
Twill is an always-on AI software engineer backed by Y Combinator. It is CLI-agnostic, running Claude Code, Codex, or OpenCode using their native harnesses in sandboxed cloud environments. Assign work from GitHub, Slack, Linear, Notion, or Asana, set up recurring schedules, or let event triggers start tasks automatically. Twill carries a persistent memory shaped by your team's best practices.
Twill strengths
- Always-on: proactive scheduling, event triggers, and recurring work on autopilot
- CLI-agnostic: runs Claude Code, Codex, or OpenCode using their native harnesses
- Multiplayer with memory: shared context your whole team can shape
- End-to-end delegation: sandboxed builds, tests, and PRs without supervision
- BYOK support: use your own API keys for full cost control
What is Devin?
Devin, built by Cognition, is an autonomous AI software engineer with its own cloud environment including a shell, browser, and code editor. Assign tasks via Slack or Devin's web interface. It plans, codes, tests, and deploys changes, and can browse documentation and interact with web interfaces during the process.
Devin strengths
- Full development environment with browser, shell, and editor
- Can browse the web to read docs and debug issues
- Detailed session playback to see exactly what it did
- Handles complex, multi-step engineering workflows
Feature Comparison
| Feature | Twill | Devin |
|---|---|---|
| Agent model | CLI-agnostic: Claude Code, Codex, OpenCode | Cognition's agent system |
| Runs in | Sandboxed cloud containers | Devin cloud environment |
| Output | Pull requests | Pull requests, deployments |
| Browser access | No (code-focused sandbox) | Yes (built-in browser) |
| BYOK support | Yes | No |
| Integrations | GitHub, Slack, Linear, Notion, Asana, Sentry | Slack, GitHub |
| CLI / API | Yes | API only |
| Session visibility | Live logs and task timeline | Full session replay with browser |
| Starting price | Free / $50 per month | $20/mo + ACUs |
The Key Difference
Twill is an always-on AI software engineer that orchestrates multiple coding CLIs. It is CLI-agnostic, so when a better agent ships, you can use it without switching platforms. Twill adds proactive scheduling, team memory, and deep integrations on top. Devin is a vertically integrated agent where the model, browser, shell, and editor are all built together, giving it capabilities like browsing documentation and interacting with web interfaces.
Twill prioritizes flexibility and integration depth. Devin prioritizes autonomous capability per session. Your choice depends on whether you value agent choice and tool integration, or single-agent depth with web interaction.
When to Choose Each Platform
Twill
Choose Twill when you want to...
- Pick the best agent for each task (Claude Code, OpenCode, Codex)
- Use your own API keys for cost control (BYOK)
- Trigger tasks from Slack, Linear, Notion, Asana, or Sentry
- Start with a free tier and scale up as needed
- Clear a backlog of well-defined tickets at scale
Devin
Choose Devin when you want to...
- Handle tasks that require browsing the web
- Debug issues across services and documentation
- See a full replay of every action the agent took
- Run complex, multi-step engineering workflows
- Invest in one deeply capable autonomous agent
Frequently Asked Questions
Can I use Twill and Devin together?
Yes. Some teams use Twill for high-volume ticket work (bug fixes, dependency updates, test writing) where cost efficiency matters, and Devin for complex, multi-step tasks that require web browsing or cross-service debugging. They serve different ends of the task complexity spectrum.
How does pricing compare?
Twill starts with a free tier and paid plans at $50/month. Devin starts at $20/month per seat with usage-based pricing for agent compute units (ACUs). Twill also offers BYOK pricing, giving teams more control over costs. Effective cost depends on task volume and complexity.
Which platform is better for a small team?
Twill is typically the better starting point for small teams. The free tier lets you try autonomous coding without commitment, and the $50/month plan covers most small team needs. Devin's per-seat plus ACU pricing can scale up quickly, so it makes more sense for teams with complex, high-value tasks.
Does Twill support the same kind of complex tasks as Devin?
Twill handles most standard engineering tasks: bug fixes, feature implementation, test writing, refactoring, and dependency updates. For tasks that specifically require browsing documentation or interacting with web interfaces, Devin has an advantage. For everything else, Twill's multi-agent approach and deeper integrations often produce better results.